FIber/Pulp for Handmade Paper

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Hey, sorry for the text only post. I´ve been making notebooks and journals (I´ll post pics soon) and so I thought I wanted to get into making handmade paper also. I already have some experience in that (although not much), and so, what I wanted to know is if anybody had some good websites where I could buy fiber or pulp for making the paper?

I looked online for a while and found this http://www.twinrockerhandmadepaper.com/tr_fiber.php?clearfiber=N
but i´m not sure if that´s what it´s supposed to cost, or how trustworthy that website is

I really appreciate any help you could give, thanks a lot in advance!